You have to go to Step 2 in the FILE section.
HOW TO CHANGE OR ENTER BANKING INFORMATION FOR REFUND
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/change-transferred-direct-dep...
You cannot change banking information while your return is in pending, nor can you change it after the return is accepted. The IRS does not allow it.
Did you already e-file? If you did NOT e-file you can go to the FILE section step 2 to enter/change how you want to receive your refund. If you want direct deposit you need the routing number and your own account number.
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